1361415-40-8Relevant academic research and scientific papers
Ring-opening polymerisation of rac-lactide mediated by cationic zinc complexes featuring P-stereogenic bisphosphinimine ligands
Sun, Hongsui,Ritch, Jamie S.,Hayes, Paul G.
, p. 3701 - 3713 (2012/05/07)
The diastereomerically pure P-stereogenic bis(phosphinimine) ligands 4,6-(ArNPMePh)2dbf [Ar = 4-isopropylphenyl (Pipp): rac-4, meso-4; Ar = 2,6-diisopropylphenyl (Dipp): rac-4a; dbf = dibenzofuran] were synthesised and complexed to zinc using a protonation-alkane elimination strategy. The cationic alkylzinc complexes thus obtained, RZn[4,6-(ArNPMePh)2dbf] [B(Ar′)4] [Ar = Pipp, Ar′ = C6H 3(CF3)2: rac-6 (R = Et), meso-6 (R = Et), rac-7 (R = Me) meso-7 (R = Me); Ar = Dipp: rac-6a (R = Et, Ar′ = C 6H3(CF3)2), rac-6b (R = Et, Ar′ = C6F5)] were investigated for their competency as initiators for the ring-opening polymerisation of rac-lactide. The formation of polylactide was achieved under relatively mild conditions (40 °C, 2-4 h) and the microstructures of the resulting polymers exhibited a slight heterotactic bias [polymer tacticity (Pr) = 0.51-0.63]. The Royal Society of Chemistry 2012.
